Serum 25-hydroxy vitamin D in coalworkers and surface workers in winter.
D015652:25-Hydroxyvitamin D 2; D003032:Coal Mining; D004872:Ergocalciferols / Q000031:analogs & derivatives* / Q000097:blood; D012621:Seasons; D013472:Sunlight
D004872:Ergocalciferols; D015652:25-Hydroxyvitamin D 2